Evaristo, I have experienced this problem too but in different way. Backgroung mooving is accidental very often if I only touch scroll function on mouse. So I have to use undo several times to restore correct state.
m.s. > 21. 1. 2018 v 20:01, Evaristo Quiroga via Therion <[email protected]>: > > Hi John, > > I have experienced the same zoom problems in Windows with the scroll wheel > use or + -. If you play with the + - you see, the trace and the background > image are well placed at 25%, 50%, 100% ,200% and 400%. When you push further > this scales the trace and background image are wrong placed. With the scroll > wheel they are wrong always because the % zoom are normally further or > between this scales. > > I think is a program bug. > > But we have a trick to overcome the problem. Only use the zoom button in the > "Drawing Area" (above the "Background image" control) to choose the scales > 25%, 50%, 100% ,200% or 400%, when you want the trace and background image > well placed. And use scroll wheel or + - when you want zoom only the trace > quickly. > > Evaristo. > > El 19/01/2018 a las 18:57, John Stevens via Therion escribió: >> A method I used to copy from a previous survey was to export the centreline >> as a xvi file. Then take a jpg of the old survey and scale it so the pixel >> count matches that of the xvi file. >> The next step was to use both images as background images in the th2 file. A >> bit of adjustment of the position location to make them match then it was >> simple to copy the old survey. >> >> Now I cant align the images as the zoom function now changes the scales of >> the two images differently. If I use a jpg to trace over and zoom in to >> trace a detailed area the scaling goes off. The resultant lines are to the >> wrong scale and/or are misplaced. >> >> Is there a way of fixing the scale of a background image so it scales >> properly. It seems to go wrong with the + – and scroll wheel. >> >> John >> >> >> _______________________________________________ >> Therion mailing list >> [email protected] <mailto:[email protected]> >> https://mailman.speleo.sk/listinfo/therion >> <https://mailman.speleo.sk/listinfo/therion> > > _______________________________________________ > Therion mailing list > [email protected] > https://mailman.speleo.sk/listinfo/therion
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